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Update compute_ip_checksum.c and ip_checksum.h to the versions from

Browse source 
kexec-tools 1.101 (the current version).

Document the origin of the files in HACKING and in the files themselves.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@203 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Uwe Hermann 2007-03-06 14:46:57 +00:00
parent 273a9b4356
commit 3acfef5b84
3 changed files with 102 additions and 26 deletions
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4
HACKING
View file

@ -49,3 +49,7 @@ Third-party Code and License Overview
Source: LZMA SDK, http://sourceforge.net/projects/sevenzip/
Current version we use: LZMA SDK 4.40 (05/2006)
* lib/compute_ip_checksum.c, include/ip_checksum.h: GPLv2
Source: kexec-tools, http://www.xmission.com/~ebiederm/files/kexec/
Current version we use: kexec-tools 1.101

23
include/ip_checksum.h
View file

@ -1,8 +1,29 @@
/*
* This file is part of the LinuxBIOS project.
*
* It was taken from kexec-tools 1.101.
*
* Copyright (C) 2003,2004 Eric Biederman <ebiederm@xmission.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef IP_CHECKSUM_H
#define IP_CHECKSUM_H
unsigned long compute_ip_checksum(void *addr, unsigned long length);
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new);
unsigned long negate_ip_checksum(unsigned long sum);
#endif /* IP_CHECKSUM_H */

101
lib/compute_ip_checksum.c
View file

@ -1,36 +1,78 @@
/*
* This file is part of the LinuxBIOS project.
*
* It was taken from kexec-tools 1.101.
*
* Copyright (C) 2003,2004 Eric Biederman <ebiederm@xmission.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <ip_checksum.h>
#include <string.h>
unsigned long compute_ip_checksum(void *addr, unsigned long length)
{
uint8_t *ptr;
volatile union {
uint8_t byte[2];
uint16_t word;
} value;
uint16_t *ptr;
unsigned long sum;
unsigned long i;
/* In the most straight forward way possible,
* compute an ip style checksum.
*/
unsigned long len;
unsigned long laddr;
/* compute an ip style checksum */
laddr = (unsigned long )addr;
sum = 0;
ptr = addr;
for(i = 0; i < length; i++) {
unsigned long value;
value = ptr[i];
if (i & 1) {
value <<= 8;
}
/* Add the new value */
sum += value;
/* Wrap around the carry */
if (sum > 0xFFFF) {
sum = (sum + (sum >> 16)) & 0xFFFF;
}
if (laddr & 1) {
uint16_t buffer;
unsigned char *ptr;
/* copy the first byte into a 2 byte buffer.
* This way automatically handles the endian question
* of which byte (low or high) the last byte goes in.
*/
buffer = 0;
ptr = addr;
memcpy(&buffer, ptr, 1);
sum += buffer;
if (sum > 0xFFFF)
sum -= 0xFFFF;
length -= 1;
addr = ptr +1;
}
value.byte[0] = sum & 0xff;
value.byte[1] = (sum >> 8) & 0xff;
return (~value.word) & 0xFFFF;
len = length >> 1;
ptr = addr;
while (len--) {
sum += *(ptr++);
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
addr = ptr;
if (length & 1) {
uint16_t buffer;
unsigned char *ptr;
/* copy the last byte into a 2 byte buffer.
* This way automatically handles the endian question
* of which byte (low or high) the last byte goes in.
*/
buffer = 0;
ptr = addr;
memcpy(&buffer, ptr, 1);
sum += buffer;
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
return (~sum) & 0xFFFF;
}
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new)
@ -51,3 +93,12 @@ unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned
}
return (~checksum) & 0xFFFF;
}
unsigned long negate_ip_checksum(unsigned long sum)
{
sum = ~sum & 0xFFFF;
sum = 0xFFFF - sum;
return ~sum & 0xFFFF;
}